The mistake, of course, would be to expect too much too soon from 21-year-old Pavel Buchnevich, the Russian blue-chip prospect who on Friday agreed to terms on a three-year entry level contract with the Rangers.

It is not a mistake the Rangers’ management or coaching staff is likely to make concerning this highly skilled winger who will need time to adapt to the NHL, but who should add to the team’s talent level up front.

“We’re all aware that Pavel is going to need some time to make the transition, but I think the world of him as a player and a person,” Chris Drury, the Rangers’ director of player development, told The Post. “The way he played against grown men and conducted himself in the KHL was extremely impressive.

“He can skate, has very good hands, he’s got a terrific shot — all kinds of shots — he’s got excellent vision, and he competes, there’s no doubt about that,” said Drury, who spent time in Russia this winter monitoring Buchnevich’s progress. “He does everything well.”

Buchnevich played three years in the KHL after his selection at 75th overall in the 2013 entry draft with the third-round pick the Blueshirts acquired from Columbus in the Rick Nash deal. The 6-foot-1, 175-pounder had 16 goals and 37 points splitting last season between Cherepovets and St. Petersburg.

Director of player personnel Gordie Clark told The Post over the winter that Buchnevich has been driven to become the first player from his hometown of Cherepovets to play in the NHL.

“He’s committed,” Clark said then. “The thing about Pavel is that he wants to be prepared to succeed when he gets to the NHL.”

To that end, Buchnevich, who does not speak English, will spend most of the summer in New York training and becoming acclimated to life in North America. It is expected that the Rangers will do what they can to add another Russian to the roster to help ease the transition.

The Post has learned the Blueshirts are conducting due diligence on veteran free agent winger Alex Radulov, who is interested in returning to the NHL, but whose last term with Nashville in 2012 ended badly. Few doubt Radulov’s ability on the ice, but there is much skepticism — to put it mildly — about his ability to be an off-ice mentor. So Radulov is probably a longshot to land on Broadway.

Buchnevich has a skill set that has been likened to impressive Washington center Evgeny Kuznetsov. But before Blueshirts partisans begin planning the parade route for next June, everyone should remember it took Kuznetsov a full year to acclimate himself to North America before he began to hit his stride.

“Pavel is so competitive, you see can see how badly he wants it,” Drury said of the left-handed shooter, who has primarily played right wing. “He works extremely hard on the ice. He’s grown into a really good playmaker, he can make the pass under duress in the defensive zone, and he works as hard without the puck as he does with it.”

Drury is attending the Rangers’ organizational meeting at Glen Sather’s retreat in La Quinta, Calif., where the staff is outlining plans for the offseason through which the club is expected to remake the mix that grew stale last season.

And while the team will correctly downplay its immediate expectations for Buchnevich, there is little doubt management is counting on him to nail down a top-nine (if not top-six) spot either directly out of camp or early in the season.

“We’re not putting a timetable on him, because there will have to be an adjustment,” Drury said. “But Pavel has the talent and the character to adapt and succeed in New York.”